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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc8dc2c5e6e9faf22ec4a3d23b41d17ade3fa071de705af24b727b21c053c17' 
  AND token = 'Puxr1+J16XgBxx/s1leJnRdrcfHHdjYGoYmBa8zbRN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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