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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c50f562b87c6b8ab3e2d9cabe42ae997059b9835ca20465dd1dc208698c395e' 
  AND token = 'TAXspibKKRjanICHRmCIAxVmpXI7b16ndG+uEn3Qq+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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