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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b02d0fe7dec574b6dacc9e25ab486bf7dd86beb0a503ccb1ea3caebb3d88916' 
  AND token = 'UaiXjjNS8O8Jl2QGtB3Q6hLwgp41w5u8X5+WsdNPprM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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