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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98394ad738d5dcf5107c1c0e0f3c46a59d9ece157170082333a2632880c2d19a' 
  AND token = 'pPISL0yEwvngVLLJTdblMYjXqCJqqH8BaEBRwFR97dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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