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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef3b61cb9b80ce34f97a82e9a228f4e2bf5f908f326cd330e6965ce0aaa3e30' 
  AND token = 'GdV18N0kI92UdQbi2AwMmUQVov/qeJ1yhnFkUFMUXH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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