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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db392ff7e4f861068255d284e708653dc91bd4707f79a1e4bf9fded6cedf79f7' 
  AND token = 'xi616BPa100tpybdKdFLbh7dkrnVRyS5my8c2qWAEQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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