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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecaa760c3e1c3921b149f6b78fdf24aa6cca17bad84dfb18bdfbc7cb82808f70' 
  AND token = 'rYintKt3OwIK/FyZWWi5EK0KnKsD7JF2tldNCd7KWI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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