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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '709d23a3e4b3e40cb175efc3f7846d44e8e53bd7584c709045225605d2b62392' 
  AND token = 'BJD2crAEAlezGksDyrUPrXb7QvuEtU71tY+tt5Nhbhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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