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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7845677872dc76da570d0f53fa8f91c2dc987efd699b95730325baa63d04e271' 
  AND token = 'SXtPkMkh4AHXcIFmI5cQarE83Ys4pvIcT38Ik1NqeWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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