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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd336150113a6f6564280fde1e86c25fd86b285f684301d7f734ba7cde162dc6b' 
  AND token = 'MgypmqM8oZjUsH4MPx8uE1VYZ6XXlyixJtk0ZJ8vAAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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