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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ea498df999e2a7978f67e954b2d9984c8e11ee61fcac7c9d198daad8974a1a' 
  AND token = 'RZnxMFKr2Q/eOOEQdYUyVwcfEfNijl2rcGKSGlLQus4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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