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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ab5ac03038b0020b42b0a3211c85d95a743e59808584914bf2b7aa2cec2933' 
  AND token = 'eodg17lExevI7T5xPAPgYFmH5PiwL0DuyZNVMyXXcPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}