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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314a4fa15e7abd12420f0a70cb23bd1bb93313edacd9969469cff8ca86e14d16' 
  AND token = 'fLR33u5FENRTXznzi5ycBY5nUx8as5VhZmMFRG93l+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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