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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72e4f225a62f39f833fa789a3d4dc3bb003cd7e778db21d32e8b3216a117b3e6' 
  AND token = '6ybTcraGxxfWjCGvjlUAhLXtHmzW0edSVyCWkW9axKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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