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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7512d84c794310e40c93dfba06d318d5d55f863ade2067bfe69bf9b39f3879b5' 
  AND token = '9x2+GcQo6zfQWWL+OOHASFVxDtmZapFBnCeE9P22lqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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