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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f85d2a6a272e4e00443e61c9f6afe096416bc202464e29b524dcce22f756e8e' 
  AND token = 'gUXhYEOQVvaaW/Lnb6uCU593tckLE4ev8Of5/Yun9JA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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