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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b6d9cae2530cc9a9f84df350f9f60e6cb468f52436a8a695c7bcbd0deceea7' 
  AND token = 'jLuGdltT74QYcPtyvL35uUV2BaCWkDiYQxyrRsOR+ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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