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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96305c79858a2272c1f7306dd321c07460a6b26284aab5694b765c6d04843b60' 
  AND token = 'dzR5/x228wZxOFG4alJ4Cw4MfXZoBkYVsXh/ctgaJ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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