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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b66dff4782eca17d858e08a6064ad8b6ab1a9bcf50d60b0f7057f3f9d168929' 
  AND token = 'q0H1lIIc4a6DMCkgVK6hOLNSCSYNAv6++6JQdtPJ16M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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