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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb122f0f8ff2ebb067f7938703de3cdc3d7b93d887ebcddfb97f9ba87f8ebc4' 
  AND token = 'ReKWBOW6nGdL1IC8epztVhOedGGcKwwPd9eEuBHfp4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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