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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d5c1467e5b28a389790a5153878379001431264d918e3c5484d712f6d7fef8b' 
  AND token = 'bOps5V1P7UcHCYtKctia2XzIaMDB1ReRwxmG4XU1r0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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