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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920a5a1c6b4388098a2bd24aca26ae4ff9d5b8774a61701045e8881afc26e215' 
  AND token = '+BEjHKNRP2hwmxAMoYNgNOp2jErF6YpNLD14NLQO9M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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