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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f9e1957689b30e75c222c15db0a81fe7b2f8e58df222b7552d6c99350b0931' 
  AND token = 'gOqbcJqPsCHQndOhrYgNd6Qq4e26nEbyvwBxwVezcls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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