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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ccc70e042e56d6d207ec8c74c0d0878ca6f90a8c7489e8152eaba967d841a2' 
  AND token = 'guOeVufAL19aupCVMSu2Y5iYO87g0i2SfXaCfAoVa2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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