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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891bade35472a1cd070c744086ecd2b20361e224b15772ed290705ec35d97748' 
  AND token = 'H8c3v0RB7hW8wMI9Nu4g7D/0d4vEP1Xx49XLtjzzWuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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