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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3453af85f9296e52de22c9d1930cac8fa73722bfbfc73f70276271ac505bf852' 
  AND token = 'tW7hH/BaAOmS9Ulz7y8kmXi59liewW9y7rK21/c029o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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