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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af3af6be91e3eee03202c8b556a9fbe4058d103805d6456965d77c96040f69c6' 
  AND token = 'cQoUrxRttLR9hwL2d0mUsmiyXC8YDIzC0u3rOyXIsso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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