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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8b62ae0505236e107cabdae5c8d1f3058759a7606ec5126155ac225e259d310' 
  AND token = 'cQ0lhyUYpZ1HqeE8Y/NGZGdYahIhJnJ60XvOSpWhA/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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