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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '396ecf19e503e4c0f86883d2031d070f2c9f2ed5eb54fabea0c001745db64818' 
  AND token = 'welpdoeGQBbJkOynr4ECZbEm8j9eTWPJvfNEkF3eD5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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