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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e4dd0bed4799f819d0f1f157300d77f0b3fc46ca03d372a236947a017dddc8' 
  AND token = '1f93jjsKhkpkkAEr5k/PAvHocydP3Hs3wXWgKbtaHmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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