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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b990b841b7b8c1c7a79bfe619cccd63a79316d412c02b22d5efdad886f2a4758' 
  AND token = 'Ej40Fz3iImuOlm5DRHJgtuwU/S0MQMzwP3Hrx3E5/4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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