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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7904c6e69fda2f5978e15ecfb2e6aeeef21d530ee40cd5f44e64f3835760f359' 
  AND token = 'dOeDaGPYPqq5sB6nh7/JENq0luptp+TwEIFr+opG5SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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