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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4915c016cb751cce201f9fa73799ac76cdb32ea2f38476cc8a4beb796366161b' 
  AND token = 'LDzwBedkcHuh53VroVqve5hw3097CrvNK/r2S+9Wa3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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