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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07da8485a88375ad19dd2f2cf62cee25b69db2d0c3412a4a3c66ef7f8826dd62' 
  AND token = 'sawt2bsH790lTvSktOrSY3zpQmlC0l/zxqR7T2hQ678=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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