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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d3f9be75fc8b1f965aacf8d405a8b75ed740294d248f204dd95a4d2f88c7a5' 
  AND token = 'LMu3NXRqR7oXJBPffklRhkEk9jyO14MthmN52hLyArc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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