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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '373ba02fcf32d121c929a29d83976077611ea57c35b458d8d7152cddf748eca6' 
  AND token = '07AB8hg6RIcY5asZmges1Q2hU1XViTu9qi3nHpR+V6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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