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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27d4ed40b247d6cca946431b8d0d92613252689cf0c5eea59942c63d6ab7a00e' 
  AND token = 'g/Xtezg7m5W7aMWxzfEVRpVDl1v/s8sqxAPoM9K5YFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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