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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08cfe6f56aa06f4ed8a7baf9c0d46a510ef5578e53698e9a3670321407e88498' 
  AND token = 'Gs7TzcDK4WBYbCr70l2O1MGIHnRtJTfNjHo2gGA57WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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