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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d8bd9c64d2ad1f8751c4a0d2f43e25cead2f1957ff4659f1711d69a8a50c83' 
  AND token = '0tkCa5xvn3aPWKrkPApUUgsfU62y6zewCMQPJ2rsffE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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