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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884b96b381b9dbf282f2f27fc06a60c6098be42957b0fac59ab560db6cbe8cb0' 
  AND token = 'vzKh1rXxW+200NkIsKeAB4ql9pjITW7nHnPH/cz23ZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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