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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697d1c4fb54cc8b25ab2fde1e7f0da140f75b6e40d3fb84bc86eb0113992353b' 
  AND token = 'rt5ojKct4Qvv+pYSpkh4BoJ98sS6PCw5FqSfk3o1Xtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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