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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff7d4e93b3017f08e09db7553e60634240a30cfe8aac52eaaaceae5560f7a74' 
  AND token = 'd4W7I2Lx8ufnkJyKtp1K86MsvrCcPKA3JllFj1rydu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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