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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7803d3850f52cd10f9100cf6635e1b4ccf9b60f1bad2c458731c440ae9eafc7c' 
  AND token = 'gP/nbLUtarPEETXr15RVt8lJfrDN8gyWBrXa/Xy257U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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