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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7d3fe83b127864a9ef733e0ca8320fb83198b54ac91ad75d61601f2bdf33a1' 
  AND token = 'tjo1GO6C41aZ+aTG6ZMVvmpwO7W9KuNnxofqGRZtPac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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