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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312be94bb41799cdbba271cf6b5094a422ba017cbec80bdcf116fd8b57479910' 
  AND token = 't8B0fxO9jRo6zeOyOaPAzbdJdtrP6sYl9Ar//h+Qrog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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