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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d40fdcfc3c44f27d58490c8cb9f5b917277473497c09e4b26f97a57472628cb' 
  AND token = 'iHVclsvTjUfboIpAHquy2aj3EFF8qRA3M78Bse5SN2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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