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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7491a663737d356337a129e1c45d1f3b6b55ac6cb3b46074117ad5f40165b0fa' 
  AND token = 'lbvHy9jGDWy4yZ7vpggzdAQ2telgKAvnjuwnkBjkzKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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