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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed076c66d37e81f7704f6a5f994040c2e424c12d2c8fecb519c625456c47b98' 
  AND token = 'oGnu8/8BOyPt67F4l5hOND0tAP/Lqmz5eiCsX0VUBlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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