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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c30f0f52111347084cb46decdd5f409913f3621440ea4e0b19703788f48da853' 
  AND token = 'mWYgXR9agT/kLlJkkGpA1zZAywW+8eSBgy6/CdrN5ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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