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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ec6edea5ea463200172e872b140afa4481ac4f7ae7f3098ed91c72e1911b3a' 
  AND token = '2yYWa+Omv7tp0IcGl+9FkNTcRBt0OiYzDVbPKBYW2zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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