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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3125285d340a7d12761cbf4fc3ed894fad2f4b85cd9165633413060d52888819' 
  AND token = 'EBZdNrCufygjvHw6bH4k3u04SxN+wDz0A62LaW6pdOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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