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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2390ba64d673756bb5014dbfe2c72e3241c23cf9cc1741df14b40d3669276a3f' 
  AND token = 'fyESRFzk94vues/nYpmf4OZG74Y/DVt9wjQ2vjO5TqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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