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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abc74c90cce7fa9a42c255eb5c2b464e952dab4a3b7afeded00c64efe6fc8d26' 
  AND token = '5SRn3eAiApl092A4dtqSJwAf90A+GGRRPuiUR4rURN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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