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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8d742566c7e9229e8d43da652b09025ec97dc689b1a3320e0dce0abe246b55' 
  AND token = 'N8yHsxbFEvgJW6VaEoyFEfhUiZsKuO2V4klTLDE7AGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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