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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4941b88bd8e7db1deef5b27b01f4140ce256c8bb08335d2b523d6b2669a7b1' 
  AND token = '1nMlK08G70Ys8yB5bcOmnSB7upqCfikymJjUc7ASp1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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