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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9828982ed0db4ed8c6dfc8f0eab3d63fab0f5c724c12f16715148e88e1966d0c' 
  AND token = '9m3q38zeacVhvOvqPCnH0pw254HptGoxBSl1pqCoeco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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